Lens apparatus



35(3452 Sgn am MSQL-q Nov. 24,1925. 1,562,463

N. T. K. MOLLBERG LENS APPARATUS Filed June 29, 1921 fm2. I

Patented Nav. 24, 192s.

UNlTEDjSTATEs Y 1,562,463' PATENT OFF-ICB,

mns THURE KRISTIAN MoLLBnnG. or sxAnsArnA, LInINGoNQswEnnN, Assronon To AMERICAN GAsAccUmULA'ron COMPANY, or ELIZABETH,- Nnw JERSEY, A

CORPORATION OF NEW JERSEY.

" w A:LIENS: APPARATUS.

Application led June 29, 1921.A Segal No. 481,392.

To all whom t may eoncerfg:

le it known that I, NILs vTHUnn Kms- TIAN llIoLLBnnG, a subject of the VKing of Sweden, residing at Skarsatra, Lidingon, Sweden, have invented certain new and useful Improvements in Lens Apparatus, of which the following is a specification.`

The present apparatus refers to an improvementin lens apparatus, especially lens apparatusv employed or adapted for aeronautic purposes. In such lens apparatus it is necessary to spread the light bundles from the horizon to the zenith. According to the invention an arrangement, performing such a dispersion is obtained, occupying a small space in radial direction, and having high eiciency in dispersing the light bundles.

Fig. 1 is a vertical sectional View of lens apparatus embodying my invention, showing a lens panel and a system of prisms arranged in frontof said-panel in accordance with the invention;

Fig. 2 is a view partly in horizontal section and partly in plan view of the said apparatus;

Fig. 3 is a view in front elevation; that is, looking toward the left in Figs. 1 and 2.

Referring to the drawing: The focus of the lens panel comprising the lens 1 and the prisms 2 is indicated at F. Y

It is a known fact 4that the light rays'adiating from the lens panel are ,spread in both vertical and horizontal directions due to the fact that the light source is not a point but has a certain extension or dimension. In order to augment the vertice1 dispersion of the light rays so that they may radiate from a horizontal pla e up to zenith or 1n any other suitable direction without affecting the horizontal dispersion thereof, a number of prisms, 3, Ll, 5 and 6, are employed in accordance with my invention, whlch prlsms are so constructed and arranged in front of the lens panel that each of them effects or causes .a part of the vertical dispersion; that 1s to say, each of the said pr1s1ns effects dispersion of a certain group of rays transmitted Lthrough or by the lens and portions ofcertain of the prisms -of the lens panel.

According to the constructlon illustrated the prisms 3 and 4 spread the rays in angles ca -3 7, close to the horizon', said prisms being dioptrical, whereas the prisms y 5 and 6,` dispersing the rays in angles -y-T-e are catadioptrical. The number of prisms employed in front of the lens panel may be increased or diminished, within'lim its, as may be desired and. may be also arranged so as to elect dispersion in a different manner and in a different direction from that shown. It is essential, however, that they spread ,the rays radiating'from the' lens apparaus from horizon to zenith.

When a head light lens is employed it ns be rotatmg and consisting of several Lens apparatus of other kinds, radiating rays in horizontal direction, may also be employed.

Having now described my invention and set forth t-he manner, in which the same 1s to be performed, what I claim is:

l. In lens apparatus, the combination of the lens, and a set of prisms, in iront of thelens, so constructed and placed as to provide -a plurality of groups of light rays, radiagroups extend in successlon from the ho`ri- Y zon to the zenith, the anglesof the rays of each roup with respect to the horizon belng di erent from the angles of the rays of cach of the other` groups wit-h'respect to such horizon.

3. In lens ap aratus of the character described, the com a set of prisms in front of the 'said lens panel, the said prisms being arranged in inaton of a lens panel and spaced parallel relation with respect to each other and operating to provide a plurality of groups of' rays transmitted through the lens of said lens panel which extend upwardly at different angles to the horizon, the lower of said prisms being dioptrical while the others are catadioptrical..

4. In lens apparatus of the character dev scribed, the combination of a lens panel comprising a lens and risms concentric therewith, and a plur 'ty of prisms situatedin front of said lens panel which prisms are arranged in spaced parallel relation with respect to each other and certain of which ar e,dio trical while the others are catadioptrica, the. said dioptrical and catadioptrical prisms dividing the rays which are transmitted through the lens panel into a plurality of independent and se arate' groups of rays which extend u war at varying angles with respect to t e horizon, the said groups extending from the horizon tothe zenith. v

5. In lens ap aratus of the character described, the com ination of a lens panel with means situated in front of said panel which divides the rays of light which radiate from said lens anel into a plurality of groupsof rays Whic extend upwardly and at different angles with respect to the horizon, the lowest one of said groups extending in a direction only slightly above that of the plane of the horizon while portions of the rays of the uppermost of said tend toward the zenith. In Atestimony whereof I have signed my name to this specication. w'

NILS THURE KRlSTlAN MOLLBER-G.

groups ex- 

